mozilla-b2g/gaia — pull request #13077 by nullaus (2013-10-24 22:12:00+00:00)
Title: Merge pull request #12927 from nullaus/bug918143-group-notifications

bug 918143(cherry picked from commit 163f47b8ca0c6f9cead75347793d8fc39bfefa59)

Conflicts:
apps/system/test/marionette/lib/notification.js
apps/system/test/marionette/notification_test.js